JPH07151486A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a heat exchanger which is manufactured easily without learing a residue of flux in a passage of a heating medium. CONSTITUTION:A layer-built evaporating device for an air-conditioning system of an automobile comprises a plurality of tube units 201 each having first and second tray type plates 202. Each tray type plate has a shallow recession provided therein, a flange stretching in the periphery and a partition wall disposed in the central part thereof and parting the right and left sides of each plate. The first plate has a plurality of projections 16 formed in the shallow recession. The second plate has a plurality of projections 17 formed in the shallow recession. The projections of the first and second plates are made to engage with each other by making one plate inserted into the other, for instance, and therefore the relative movement of the plates in a separating direction and a sliding direction is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to heat exchangers as refrigeration circuits, and more particularly to a heat transfer medium guiding element which constitutes the heat exchange area of a heat exchanger.

[0002]

Various types of heat exchangers are known in the prior art. For example, US Pat. No. 5,211,11
No. 1 discloses a laminated heat exchanger used in an evaporator of an air conditioning refrigeration circuit of an automobile, as shown in FIGS. 1 to 3. 1 to 3, the laminated evaporator 200 ′ functions as a heat medium guiding element and, together with the corrugated fins, the heat exchange area 200a of the evaporator 200 ′.
A plurality of tube units 201 made of an aluminum alloy forming the. Each of the tube units 201 has a set of tray type plates 202 having a clad structure in which a brazing metal sheet is applied to a core material.

As shown in FIGS. 2 and 3, each of the tray-type plates 202 is made with a shallow recess 120 defined therein, a flange 13 formed around it, and a central portion thereof. And a narrow partition wall 14 that is open. The narrow partition wall 14 extends downward from the upper end of the plate 202 and is approximately 1 / 7th of the lower end of the plate 202.
Ends at the length of. The narrow partition wall 14 includes a flat upper surface 14a. A plurality of diagonally extending semi-cylindrical projections 15 extending from the upper right to the lower left have shallow depressions 120.
Protruding from the inner bottom surface of the. The semi-cylindrical projections 15 are aligned with each other in each of a plurality of rows, for example, four rows. Two rows of the semi-cylindrical projections 15 are arranged in the shallow recess 120 on the right side of the narrow partition wall 14, and two rows of the semi-cylindrical projections 15 are also arranged in the shallow recess 120 on the left side thereof. The semi-cylindrical projection 15 includes a raised portion (ridge line portion) 15 a and is used to reinforce the mechanical strength of the plate 202.

Each tray-type plate 202 includes a pair of tapered mating tongues 203 projecting upwardly from the upper end. One of the tongues 203 is on the right side of the narrow partition 14 and the other tongue 203 is on its left side. The recess 203a is formed in the center of the tongue 203, extends vertically from its upper end to its lower end, and is connected to the shallow recess 120 of the plate 202.
The bottom surface of the recess 203a is formed to be flat with the inner bottom surface of the shallow recess 120. A pair of semi-cylindrical protrusions 204 extending diagonally is formed on the bottom surface of the recess 203a. The semi-cylindrical projection 204 also includes a raised portion (ridge line portion) 204 a and is used to reinforce the mechanical strength of the tongue portion 203. The semi-cylindrical protrusions 204 are vertically aligned with each other and are offset from the two rows of semi-cylindrical protrusions 15 formed on the inner bottom surface of the shallow depression 120.

The end of the flat top surface 14a of the narrow partition wall 14, the flat top surface of each of the tongues 203, the ridge 15a of the semi-cylindrical projection 15 and the ridge 204a of the semi-cylindrical projection 204 are: , Flush with the flange 13. Therefore,
When the pair of plates 202 are joined together by the flange 13 to form a U-shaped passage 205 between them, the pair of tongues 203 of the pair of plates 202 form a pair of tapered hollow connecting portions 203b. And the narrow partition walls 14 of each plate 202 are in contact with each other at their flat upper surfaces 14a, and the semi-cylindrical projections 15 are the protrusions 1.
5a are in contact with each other in a direction in which the inclination direction is reversed, and the semi-cylindrical projection 204 of the tongue-like portion 203 forms the protruding portion 204
The a contact each other in a direction in which the inclination direction changes in the opposite direction. The flange 13 of the plate 202, the flat upper end surface of each of the tongues 203, the flat upper surface 14a of the narrow partition wall 14 of the plate 202, the semi-cylindrical projection 15 of the plate 202, and the semi-cylindrical projection of the tongue 203. The 204 are firmly adhered to each other by brazing or the like.

Stacked evaporator 200 'further includes a pair of parallel, end-closed cylindrical pipes 230 and 240 located above the top surface of stacked tube unit 201. As shown in FIG. 2, the cylindrical pipe 230
Is located in front of the cylindrical pipe 240. A plurality of general oval slots 231 are formed at equal intervals along the lower curved surface of the cylindrical pipe 230. A plurality of generally oval slots 241 are also formed equidistantly along the lower curved surface of the cylindrical pipe 240. Normally, the oblong slot 231 of the pipe 230 and the oblong slot 241 of the pipe 240 are aligned to receive a pair of tapered hollow hollow joints 203b in the tube unit 201. . A pair of tapered hollow coupling portions 203b of the tube unit 201
Is inserted into the slots 231 and 241 until the lower ends of the coupling portions 203b contact the inner peripheral surfaces of the slots 231 and 241 respectively. A pair of tapered hollow coupling portions 203b are provided in slots 231 and 241, respectively.
For example, they are firmly joined by brazing.

A pair of circular openings 232 and 233 (FIG. 1) are formed at the left and right ends of the front cylindrical curved surface portion of the cylindrical pipe 230, respectively. One end of the inlet pipe 50 is firmly coupled to the opening 232 of the cylindrical pipe 230, and one end of the outlet pipe 60 is connected to the cylindrical pipe 230.
Is firmly connected to the opening 233 of the. Inlet pipe 50
Has a pipe joint 50a at the other end, and the outlet pipe 60 likewise has a pipe joint 60a at the other end.

As shown in FIG. 1, a cylindrical pipe 23
A circular plate partition plate 234 is firmly fixed to an intermediate portion inside the cylindrical pipe 230 in order to divide 0 into a left side portion 230a and a right side portion 230b.

The rectangular flange 18 projects from the lower end of the plate 202, and is bent downward at its end so as to form a crank shape. The downwardly bent portions of the adjacent flanges 18 are in contact with each other so as to form a space 21 between the adjacent tube units 201.

The heat exchange area 200a of the evaporator 200 '
Is formed by stacking a plurality of tube units 201 on each other and inserting the corrugated fins 20 in the spaces 21 between the adjacent tube units 201.
The pair of side plates 22 are disposed on the leftmost side of the evaporator 200 ′ and the left side of the plate 202 a and the evaporator 200.
It is attached to the right side of the plate 202b located on the rightmost side of the '. The corrugated fins 20 are placed between the side plate 22 and the plate 202a and between the side plate 22 and the plate 202b, respectively. The lower end of the side plate 22 includes a rectangular flange 22a that projects inward and is bent downward to form a crank shape at its end. Individual tube unit 201, corrugated fin 2
0 and the side plates 22 are fixedly attached to each other by conventional means such as brazing. Although the corrugated fins 20 are shown only at the upper and lower ends of the space 21 in FIG. 1, they extend continuously along the entire length of the space 21.

In the evaporator 200 'described above, when the air conditioning and refrigeration circuit of the automobile is operating, the refrigerant flows from the condenser (not shown) of the refrigeration circuit to the inlet pipe through the pressure reducing device such as an expansion valve. Cylindrical pipe 23 through 50
It flows to the left side portion 230a inside 0. At the same time, the refrigerant flowing through the left side portion 23a inside the pipe 230 passes through the inside of the tapered hollow coupling portion 203b (fluid communication opening or refrigerant inlet / outlet) to the upper right side of the U-shaped passage 205 of each tube unit 201. Pour in. U-shaped passage 2
The refrigerant in the upper right part of 05 moves toward the lower right part of the U-shaped passage 205 while taking a complicated flow path including a diagonal flow path and a straight flow path as shown by a solid arrow in FIG. It flows and exchanges heat with the air passing along the corrugated fins 20 in the meantime. The refrigerant in the lower right part of the U-shaped passage 205 changes its direction at the end of the narrow partition wall 14, and as shown by the solid arrow in FIG.
05 is directed from the right side to the left side. That is, FIG.
Then, the refrigerant flows from the front side to the rear side of the U-shaped passage 205, and while exchanging heat with the air passing along the corrugated fins, taking a complicated flow passage, the U-shaped passage 205
Flow upwards towards the upper left side of the tube and finally out through the tapered hollow coupling portion 203b to the outside of the U-shaped passage 205 of each tube unit 201. In reality, the tube unit 201 is a pair of plates 20.
Since the two are combined, the refrigerant flows along one plate 202 as described above, but the semi-cylindrical projections 15 and 204 of the other facing plate 202 are inclined in the opposite direction, so Since the flow of the refrigerant along the flow intersects with the above, the flow in the tube unit 201 mixes with the refrigerant and the heat is efficiently exchanged. The refrigerant flowing out of the U-shaped passage 205 from each tube unit 201 is a cylindrical pipe 24.
Together inside the 0, it flows from left to right.

The refrigerant flowing through the inside of the right side of the cylindrical pipe 240 is at the same time a tapered hollow connecting portion 20.
U-shaped passage 2 of each tube unit 201 through 3b
It flows into the upper left part of 05 and is a U-shaped passage 20 with a complicated flow path.
5 flows downward toward the lower left of 5 and exchanges heat with the air passing along the corrugated fins 20 (flow opposite to the flow in FIG. 3). The refrigerant at the lower left of the U-shaped passage 205 changes its direction at the end of the thin partition wall 14 and changes its direction.
05 is directed from left to right. That is, FIG.
Then, the refrigerant flows from the rear side to the front side of the U-shaped passage 205, takes a complicated flow passage while exchanging heat with the air passing along the corrugated fins, flows upward to the upper right side of the U-shaped passage, and finally. Tapered and hollow coupling part 203b
Through each tube unit 201 to U-shaped passage 205
Flows out of. U of each tube unit 201
The refrigerant flowing out of the character passage 205 is a cylindrical pipe 23.
They come together in the right part 230b inside the 0 and flow therethrough from left to right. The refrigerant, which has changed from the mixed phase of gas and liquid to the gas phase in the process of passing through the evaporator 200 ′ through the decompression device such as an expansion valve, is cooled by the cylindrical pipe 230.
Through the outlet pipe 60 to the right of the inner right side portion 230b of the compressor to the suction chamber of the compressor (not shown) of the refrigeration circuit.

[0013]

In the process of manufacturing the evaporator 200 ', the pair of plates 202 are opposed to each other, for example, the plate of the flange 13, the flat upper surface of the tongue 203, and the flat surface of the narrow partition wall 14. Joining surfaces such as the upper surface 14a, the intersection of the raised portions 15a of the semi-cylindrical projection 15 and the intersection of the raised portions 204a of the semi-cylindrical projection 204 are
Generally, they are connected to each other by brazing in an inert gas atmosphere such as nitrogen gas. Usually a pair of plates 20
In order to braze the two, the aluminum oxide formed on the surfaces to be joined must be thoroughly and effectively removed before the plates 202 are brazed together. For example, the mating surfaces are fluxed to remove the aluminum oxide formed therein.

According to the method of treating the plate 202 with the flux, the flux is dissolved in water and sprayed on the joint surface of the plate 202. However, according to this treatment method, it is not possible to spray the flux solution only on the joint surface. Further, the flux solution is applied to the shallow depression 12 of the pair of plates 202.
Even the non-bonded surfaces such as the inner bottom surface of 0 and the bottom surface of the recess 203a are sprayed. Therefore, the pair of plates 2
After brazing 02 with each other, flux residue remains on the inner bottom surface of the shallow recess 120 and the bottom surface of the recess 203a.

It has been observed that flux residues shorten the life of the heat exchanger. Debris from the flux residue circulates through the refrigeration circuit during operation of the vehicle air conditioning system. Then, the debris of the flux residue circulating through the refrigeration circuit is clogged in the refrigerant flow path of the refrigeration circuit, thus seriously damaging the air conditioning system of the automobile or weakening the heat exchange effect.

In order to avoid the above drawbacks, it has been proposed to braze each element of the evaporator in vacuum, ie the "vacuum brazing method". However, the vacuum brazing method requires a relatively large space for the vacuum pump, and complicated and frequent maintenance is required to ensure a proper amount of vacuum in the brazing furnace.

Therefore, an object of the present invention is to provide a heat exchanger which can be easily manufactured without producing a residue of flux in the heat medium passage of the heat exchanger.

[0018]

According to the present invention, there are a plurality of stacked tube units, each of said tube units having a first and a second plate coupled to each other. A fluid passage between the plates and the first
And at least one fluid communication opening extending from the second plate and communicating with the fluid passage, each of the first and second plates having a shallow recess and a periphery of the recess. A flange extending to the middle of the recess, and a wall extending in the range of each of the first and second plates and defining left and right sides of the first and second plates. At least one conduit disposed on an upper surface of the plurality of laminated tube units, the at least one conduit including a plurality of conduits for receiving the at least one fluid communication opening in the plurality of laminated tube units. Having a slot; and provided on at least one of the first and second plates for securing at least one of the first and second plates A plurality of engagement means; the engagement means includes a plurality of first protrusions provided in the shallow recess of the first plate and a plurality of second protrusions provided in the shallow recess of the second plate. And the first and second protrusions engage with each other to prevent axial and radial movements of the first and second plates. can get.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 4-10 show a first heat exchanger according to the present invention.
The example of is shown. In the figure, the reference numerals are used to indicate the elements corresponding to the reference numerals in FIGS. 1 to 3, and therefore detailed description thereof is omitted.

Referring to FIG. 4, the laminated evaporator 200 includes a plurality of aluminum alloy tube units 201. The tube unit 201 functions as a heat medium guiding element that forms the heat exchange area 200a of the evaporator 200 together with the corrugated fins 20. Each tube unit 20
1 includes a pair of tray type plates 202 having a clad structure in which a brazing metal sheet is applied to a core material.

With particular reference to FIG. 6, a plurality of cylindrical projections 1
6 and 17 project from the bottom surface of the recess 203a and the inner bottom surface of the shallow recess 120. The cylindrical protrusions 16 and 17 are formed by, for example, burring. The cylindrical protrusion 16 has a recess 203a on the right side of the narrow partition wall 14 and a shallow recess 120.
And the cylindrical protrusion 17 is on its left side. The cylindrical protrusions 16 are arranged side by side in a plurality of rows at regular intervals. The rows of the cylindrical protrusions 16 are arranged at a constant interval, but the adjacent rows of the cylindrical protrusions 16 are relatively displaced by about 1/2 of the interval dimension of the protrusions 16. From another viewpoint, the cylindrical protrusions 16 are arranged in a plurality of rows and are diagonally arranged at regular intervals.

The arrangement of the cylindrical projections 17 is similar to that of the cylindrical projections 16. The arrangement of the cylindrical projections 16 and 17 on one of the pair of plates 202 is similar to that of the other plate 202 so that the plates 202 can be joined.

The cylindrical projections 16 and 17 are shallow recesses 1 in FIG.
Although not shown in the central portion of 20, the cylindrical protrusion 1
It should be understood that 6 and 17 are provided over the entire length of the shallow depression 120. As best shown in FIGS. 7 and 8, the inner diameter D1 of the cylindrical projection 16 is slightly larger than the outer diameter D2 of the cylindrical projection 17. Further, the upper end surface of each of the cylindrical projections 16 and 17 is formed by the flat upper surface 14a of the narrow partition wall 14, each tongue portion 2
The flat upper end surface of 03 and the horizontal surface of the flange 13 extend slightly above. Partition wall 1 having a plurality of, for example, five rectangular openings 14b (FIG. 6) being narrow
4, a flat upper surface 14a of the partition wall 14 along the entire length of 4
Is formed.

As shown in FIGS. 9 and 10, the evaporator 2
00 is temporarily assembled in the manufacturing process, the flat surface of the flange 13, the flat upper end surface of the tongue 203 (not shown in FIGS. 9 and 10), and the flat upper surface 14a of the narrow partition wall 14 are formed.
And the pair of plates 202 are temporarily joined to each other. When the pair of plates 202 are temporarily joined together, the upper ends of the cylindrical protrusions 17 closely fit the upper ends of the corresponding cylindrical protrusions 16 as shown in FIG.

After the evaporator 200 is temporarily assembled, the evaporator 2
The elements that make up 00 are generally firmly joined together by brazing in an inert gas such as nitrogen gas. In this process, the joint surfaces of the pair of plates 202 are brazed to each other so as to connect the pair of plates 202 to each other. Before the mating surfaces of the pair of plates 202 are brazed together, the surfaces to be mated are fluxed to remove the aluminum oxide formed thereon.

According to the first embodiment, the flux is dissolved in water and sprayed over the entire outer surface of the pair of temporarily assembled plates 202. Some of the flux solution on the outer surfaces of the pair of temporarily assembled plates 202 is
It penetrates into a small gap between the joint surface of the flange 13 and the upper end surface of the tongue 203. Further, some of the flux solution on the outer surface of the temporarily assembled plate 202 permeates into a small gap formed between the joint surfaces from the narrow partition wall 14 to the rectangular opening 14b.

Further, the pair of plates 2 which are temporarily assembled
The flux solution on the outer surface of 02 penetrates into a small gap between the peripheral surface inside the upper end of the cylindrical protrusion 16 and the peripheral surface outside the upper end of the cylindrical protrusion 17.

In this way, the flux solution is substantially introduced into the entire joint surface of the pair of plates 202 temporarily assembled.
Therefore, the pre-assembled plate 2 to be brazed
The entire bonding surface of 02 is treated sufficiently and effectively by the flux so that the aluminum oxide formed on it when the bonding surfaces of the plate 202 are brazed together is sufficiently removed.

Further, instead of spraying the flux solution, the flux powder may be adsorbed on the entire outer surface of the plate 202 temporarily assembled by electrostatic adsorption.
The flux powder adsorbed on the outer surface of the temporarily joined plate 202 by this processing method is melted before the brazing metal sheet is melted, and the melted flux is sufficiently absorbed into the entire joint surface of the temporarily assembled plate 202. .
Therefore, the temporarily joined plate 202 to be brazed
The entire joining surface of the plate is sufficiently and effectively treated by the flux so as to sufficiently remove the aluminum oxide formed on the joining surfaces of the plate 202 when brazing the joining surfaces to each other.

According to this embodiment, since only the outer surface of the temporarily joined plate 202 is covered with the flux, no flux residue is formed on the bottom surface of the recess 203a and the inner bottom surface of the shallow recess 120. Therefore, the debris of the remaining flux is not clogged in the refrigerant flow path of the automobile air conditioning system. In addition, flux residues are removed without the use of the complicated and expensive "vacuum brazing method" described above.

Furthermore, since the upper ends of the cylindrical protrusions 16 and the corresponding upper ends of the cylindrical protrusions 17 are brazed to each other, the mechanical strength of the tube unit 201 is reinforced. Further, since the cylindrical projections 16 and 17 are arranged in a plurality of rows and are diagonally aligned with each other, a complicated flow path, that is, a diagonal flow path and a straight line are formed through the U-shaped passage 205 defined by the tube unit 201. The refrigerant will flow through the target flow path. Therefore, the effect of heat exchange of the evaporator 200 is enhanced.

11, FIG. 12, FIG. 13, FIG. 14, and FIG.
-Fig. 16, Fig. 17-Fig. 19, Fig. 20, Fig. 21, Fig. 22-
24, 25, 26, 27, and 28-FIG.
1 shows the second to fourteenth embodiments of the heat exchanger according to the present invention. In the figures, reference numerals are used to indicate corresponding elements in FIGS. 1-10, and therefore detailed description thereof is omitted. Further, the operations and effects of the second to fourteenth embodiments are the same as those of the first embodiment, so detailed description thereof will be omitted as well.

Referring to FIG. 11 showing the second embodiment, the cylindrical projections 16 and 17 are provided in the recesses 203a and the shallow recesses 120 on the left and right sides of the narrow partition wall 14, respectively. Cylindrical protrusion 16
Lie in rows and lie next to each other at regular intervals. The cylindrical protrusions 17 are also arranged side by side in a plurality of rows at regular intervals. The rows of the cylindrical projections 16 and the rows of the cylindrical projections 17 are alternately arranged at regular intervals,
The cylindrical protrusions 16 or 17 are displaced by a distance of 1/2 of the distance. According to another aspect, the cylindrical protrusions 16 and 17 are alternately arranged in a plurality of diagonal rows at regular intervals.

Since the cylindrical protrusions 16 and 17 on one of the pair of plates 202 are placed so as to correspond to the cylindrical protrusions 17 and 16 of the other plate 202, respectively, the pair of plates 202 are arranged relative to each other. Can be joined.

Referring to FIG. 12 showing the third embodiment, the cylindrical projections 16 and 17 are arranged in the recesses 203a and the shallow recesses 120 on the left and right sides of the narrow partition wall 14, respectively. The cylindrical protrusions 16 are arranged in a plurality of rows in the longitudinal direction at regular intervals. The cylindrical protrusions 17 are also arranged in a plurality of rows in the vertical direction at regular intervals.
The rows of cylindrical protrusions 16 and the rows of cylindrical protrusions 17 are alternately arranged at regular intervals. The spacing between the rows of cylindrical protrusions 17 is the same as the spacing between the rows of cylindrical protrusions 16. According to another aspect, the cylindrical protrusions 16 and 17 are arranged at regular intervals in a plurality of diagonal lines.

The cylindrical projections 16 and 17 on one of the pair of plates 202 are arranged so as to correspond to the cylindrical projections 17 and 16 of the other plate 202 respectively, so that the pair of plates 202 can be connected to each other. .

Referring to FIG. 13, which illustrates a fourth embodiment, the cylindrical protrusion 16 is over the shallow recess 120 and recess 203a on one of the pair of plates 202. The cylindrical protrusions 16 are arranged in a row in the lateral direction at regular intervals. The rows of cylindrical projections 16 are spaced at regular intervals, while the adjacent rows of cylindrical projections 16 are
It is arranged with a shift of half the length of 6. According to another aspect, the cylindrical protrusions 16 are arranged in a plurality of diagonal lines at regular intervals.

The arrangement of the cylindrical protrusions 17 on the other side of the pair of plates 202 is similar to that of the cylindrical protrusions 16 of the plate 202 so that the pair of plates 202 can be combined with each other.

Referring to FIG. 14, which illustrates the fifth embodiment, the pair of plates 202 are integrally formed through a narrow, elongated planar portion 206 that extends adjacent the vertical portion of the flange 13. The surface of the flat portion 206 is the same as the flat surface of the flange 13. The plate 202 of the pair has a flat portion 206.
Are joined together by folding. In this embodiment the cylindrical projections 16 and 17 are shown as being arranged on the plate 202 in the same way as in the first embodiment, but the arrangement of the cylindrical projections 16 and 17 on the plate 202 is not there. It is not limited to. The arrangement of the cylindrical protrusions 16 and 17 on the plate 202 can be provided in various configurations (as shown in FIGS. 11-13). According to the fifth embodiment, since the pair of plates 202 are connected by the bent flat portion, the cylindrical protrusions 16 of the pair of plates 202 are provided after the step of temporarily assembling the tube unit 201 that is temporarily connected. , 17 is effectively prevented from sliding in the radial direction.

Referring to FIGS. 15 and 16 showing the sixth embodiment, each tube unit 201 has a cylindrical projection 31.
And 32, for example, four engaging portions 30 are provided. As shown in FIG. 15, a pair of tapered hollow connecting portions 203b are provided with two engaging portions 30, respectively, and the other two engaging portions 30 are at the lower left and right corners of the tube unit 201. It is equipped with each.

As shown in FIG. 16, the inner diameter D3 of the cylindrical protrusion 31 is 2 times the inner diameter D1 of the cylindrical protrusion 16.
The outer diameter D4 of the cylindrical protrusion 32 is
It is twice as large as the outer diameter D2. The inner diameter D3 of the cylindrical protrusion 31 is slightly larger than the outer diameter D4 of the cylindrical protrusion 32. Further, the upper end surface of each cylindrical protrusion 31 and 32 has a flat upper surface 14a (shown in FIG. 7) of the thin partition wall 14 and a flat upper end surface of each tongue portion 203 (see FIG. 6).
(Shown in FIG. 7) and the plane of the flange 13 (shown in FIG. 7). Moreover, the cylindrical protrusion 1
The height of the cylindrical protrusion 31 is higher than the height of 6. Similarly, the height of the cylindrical protrusion 32 is higher than the height of the cylindrical protrusion 17.
Therefore, during the process of temporarily assembling the tube unit 201, the four engaging portions 30 are coupled first and the relative positioning of the pair of plates 202 can be performed, so that the cylindrical protrusions (16) and (17) after that can be positioned. Easy to combine.

17 to 19 showing the seventh embodiment.
With reference to, the plurality of cylindrical raised portions 161 are formed on the inner bottom surface of the shallow recess 120. A plurality of cylindrical raised portions 171 identical to the raised portion 161 of the cylinder correspond to the shallow raised portions 161 of the cylindrical shape when the plates 202 are joined together.
Is formed on the inner bottom surface. A circular opening 161b is in the center of the flat bottom end 161a of each raised portion 161. A circular opening 171b is also centrally located in the flat bottom end portion 171a of each raised portion 171. The diameter of the circular opening 171b is about 3 times the diameter of the circular opening 161b. The upper surface of the flat bottom end 161a of the ridge 161 is flush with the plane of the flange 13, the flat upper surface 14a of the narrow partition wall 14 and the flat upper end surface of the tongue 203 (shown in FIG. 6). On the same side. The top surface of the flat bottom end 171a of the ridge 171 includes the flat surface of the flange 13, the flat top surface of the thin partition wall 14, and the flat top surface of the tongue 203 (shown in FIG. 6). The same on the same plane.

Thus, as seen in FIG. 18, when the pair of plates 202 are tentatively joined, the ridges 161 and 171 are in contact with each other at the top surfaces of their flat bottom ends 161a and 171a. , The flanges 13 are in contact with each other, the tongues 203 are in contact with each other at their flat upper end surfaces (FIG. 6) and the narrow partition walls 14 are in contact with their flat upper surfaces 14a. As seen in FIG. 19, the inner perimeter of the circular opening 161b of each ridge 161 is bent downward to form a cylindrical protrusion 161c. The cylindrical protrusion 161c has a raised portion 171.
The ridges 161 and 171 are firmly engaged with each other because they are fitted in the opening 171b of the.

According to the seventh embodiment, the raised portions 161 and 1
Due to the firm engagement of 71, relative sliding of the plate 202 in the radial direction of the cylindrical projections 161 and 171 is effectively prevented after the process of temporary assembly of the tube unit 201.

FIG. 20 shows an eighth embodiment. In this embodiment, the axial length of the cylindrical protrusion 161c 'is longer than that of the cylindrical protrusion 161c of the seventh embodiment. According to this embodiment, the cylindrical protrusion 161c ′ is more sufficiently received by the circular opening 17b of the raised portion 171, so that the relative sliding of the plate 202 in the radial direction is caused by the temporary assembly of the tube unit 201. More effectively blocked after the process.

FIG. 21 shows a ninth embodiment. In this embodiment, the distal end of the cylindrical protrusion 161c of the eighth embodiment is bent outward so as to firmly engage with the inner peripheral portion of the circular opening 171b of the raised portion 171. Therefore, relative sliding of the plate 202 in the radial direction is more effectively prevented after the process of temporarily assembling the tube unit 201.

22 to 24 show a tenth embodiment. As shown in FIG. 22, the diameter of the circular opening 171 b ′ of the raised portion 171 is equal to that of the circular opening 16 of the raised portion 161.
It is almost the same as that of 1b. As shown in FIG. 23, when the pair of plates are temporarily joined, the ridges 161 and 1
71 abut each other on the upper surfaces of their flat bottom ends 161a and 171a, the flanges 13 abut one another on their planes, and the tongues 203 (shown in FIG. 6) their flat top surfaces. And the narrow partitions 14 abut one another at their flat upper surface 14a. As shown in FIG. 24, the inner peripheral portion of the circular opening of each raised portion 161 is bent downward by bending the inner peripheral portion of the circular opening 171b of each raised portion 171, thereby forming a cylindrical shape. Cylindrical protrusions 161d and 171c having an outer peripheral surface of a cylindrical protrusion 161d that engages with an inner peripheral surface of the protrusion 171c are formed. Therefore, in this embodiment, relative sliding of the plate 202 in the radial direction is more effectively prevented after the step of temporarily assembling the tube unit 201.

Referring to FIG. 25 showing the eleventh embodiment, a plurality of circular openings 162 are formed on the inner bottom surface of the shallow recess 120. A plurality of cylindrical protrusions 172 are formed on the inner bottom surface opposite the shallow depressions 120 to correspond to the circular openings 162 when the pair of plates 202 are joined together. The diameter of the circular opening 162 is equal to that of the cylindrical protrusion 1.
Slightly larger than the outer diameter of 72. Cylindrical protrusion 172
Has an axial length of about twice the depth of the shallow depression 120. Thus, when the pair of plates 202 are coupled to each other, the bottom ends of the cylindrical protrusions 172 are firmly received by the corresponding cylindrical protrusions 162, and the bottom end faces of the cylindrical protrusions 172 are the outer bottom surface of the shallow recess 120. Touch.

Referring to FIG. 26 showing the twelfth embodiment, a plurality of cylindrical ridges 163 are formed on the inner bottom surface of the shallow recess 120. A plurality of cylindrical protrusions 173 are formed on the inner bottom surface opposite to the shallow recesses 120 so as to correspond to the cylindrical protrusions 163 when the pair of plates 202 are coupled to each other. The circular opening 163b is formed on each raised portion 1.
63 at the center of the flat bottom end 163a. The diameter of the circular opening 163b is slightly larger than the outer diameter of the cylindrical protrusion 173. The axial length of the cylindrical protrusion 163 is a shallow depression 120.
It is about 1/3 of the depth. The axial length of the cylindrical protrusion 173 is about 5/3 of the depth of the shallow depression 120. Thus, when the pair of plates 202 are joined together, the distal ends of the cylindrical projections 173 fit snugly into the corresponding circular openings 163, and the bottom end surface of the cylindrical projections 173 is the flat end of the ridge 163. It extends slightly from the outer surface of the portion 163a.

The means of engagement disclosed in the eighth to twelfth embodiments are freely selectable. For example, as shown in FIG. 11 to FIG. 13, the protrusions of different sizes are displaced from each other in every other row, every other column, or in a diagonal column, or a position obtained by a combination of any of the above. The engagements described above may be positioned such that they are arranged in

FIG. 27 shows a thirteenth embodiment embodying the features of the embodiments shown in FIGS. 18 and 26. In this embodiment, the contact between the cylindrical protrusions 164 and 174 is shown in FIG.
Similar to the configuration shown in. Furthermore, although the arrangement of the cylindrical protrusions 163 and 173 is similar to the configuration shown in FIG. 26,
They are arranged alternately in each row.

28-31 showing a fourteenth embodiment, an evaporator 200 "includes a plurality of aluminum alloy tube units 11 which act as refrigerant guiding elements.
The tube units 11 form the heat exchange area 200a of the evaporator 200 ″ with the corrugated fins 20. Each tube unit 11 has a pair of tray type plates having a clad structure in which a brazing metal sheet is attached to a core material. The tray-shaped plate 12 includes a shallow recess 120, a flange 13 formed around the periphery, and a narrow partition wall 14 formed in the central region of the shallow recess 120. The narrow partition wall 14 includes the plate 12.
Extends downward from the upper end surface of the plate 12 and terminates at about 1/8 of its length from the lower end of the plate 12. The narrow partition wall 14 includes a flat top surface. Multiple, for example, 6
Two rectangular openings 14b are formed in the flat upper surface of the partition wall 14 along the entire length of the partition wall 14.
A pair of truncated pyramidal ridges 41 are formed on the top of the plate 12 so that each ridge 41 defines a hollow space 41b. An oval opening 41a is formed on the bottom surface of each raised portion 41. A plurality of truncated pyramid-shaped protrusions 42, for example, three protrusions 42 protrude from the inner bottom surface of the shallow depression 120 adjacent to the inner surface of each raised portion 41. Each of the three protrusions 42 includes a flat upper surface 42a. Since the rectangular openings 42b are on the flat upper surface of each projection 42, the flux on the outer surface of the projections 42 penetrates through the rectangular openings 42b into the gap created between the joint surfaces of the projections 42. A rectangular flange 18 projects from the lower bottom of the plate 12 and is bent downward at a right angle at its end.

The plane of the flat upper surface of the narrow partition wall 14 and the plane of the flat upper surface of the protrusion 42 are in contact with the plane of the flange 13. Therefore, when the pair of tray-shaped plates 12 are joined together to create a U-shaped passage therebetween, the narrow partition walls 14 of each plate 12 have their flat upper surfaces 14a.
, And the protrusions 42 of each plate 12 meet at their flat upper surface 42a.

The evaporator 200 "is formed by laminating the corrugated fins 20 and the plurality of tube units 11 which are inserted in the space 21 interposed between the adjacent tube units 11 together. As shown in FIG. The tube unit 11 located on the leftmost side of the vaporizer 200 ″, which is located, includes a tray-type plate that does not have a raised portion 41. The plate 12a includes an elliptic cylindrical tank 43 that is firmly connected to its upper end. The interior of the tank 43 is connected to the hollow space 31b in the adjacent front ridge 41 of the plate 12 through an opening (not shown here) formed in the upper end of the plate 12a. Evaporator 200 "
The tube unit 11 on the rightmost side of the
Includes tray type plate without 1. The plate 12b has an elliptic cylinder tank 44 firmly fixed to the upper end thereof. The interior of the tank 44 likewise connects through an opening (not shown here) formed in the upper end of the plate 12b to a hollow space 41b in the adjacent front ridge 41 of the plate 12. There is.

The tank 43 has a circular opening 4 formed on the front surface.
3a. The tank 44 has a circular opening 44a also formed in the front surface. One end of the inlet pipe 50 is connected to the opening 43a of the tank 43, and the outlet pipe 6
One end of 0 is connected to the opening 44 a of the tank 44. The inlet pipe 50 has a pipe joint 50a at the other end, and the outlet pipe 6
Similarly, 0 also has a pipe joint 60a at the other end.

The pair of plate sides 22 are connected to the right side of the side plate 12b and the left side of the side plate 12a, respectively, and the corrugated fins 20 are connected to the side plate 22.
And the plate 12a, and between the side plate 22 and the plate 12b. The lower end of the side plate 22 includes a rectangular flange 22a that projects inwardly and then turns downwards at its end at approximately a right angle. The tube units 11, the corrugated fins 20 and the side plates 22 are firmly connected to each other by a conventional method such as brazing.

Although the corrugated fins 20 are shown in FIG. 28 only at the upper and lower ends of the intervening spaces 21, it is understood that the corrugated fins 20 extend continuously along the entire length of the intervening spaces 21. Should be.

Furthermore, the tray-shaped plate 12c located at the center of the evaporator 200 "includes a pair of raised portions 41, but the raised portion 41 on the front side of the evaporator has an elliptical opening 41a. Note that the longitudinally adjacent hollow spaces 41b of the pair of ridges 41 are joined together through an elliptical opening 41a, thereby forming a pair of parallel conduits. One conduit is located in front of the evaporator 200 "and the other conduit is behind the evaporator 200". The conduit on the front side of the evaporator 200 "is left and right by the ridge 41 on the front side of the plate 12c. It is divided.

The plurality of cylindrical protrusions 16 and 17 are shallow depressions 1.
It projects from the inner bottom surface of 20. The cylindrical protrusions 16 and 17 are formed by, for example, burring. The extent and arrangement of the cylindrical projections 16 and 17 is similar to that of the first embodiment. Of course, in this embodiment, the cylindrical projections 16 and 17 can be in any arrangement as shown in FIGS. 11-13. The arrangement of the cylindrical projections 16 and 17 is similar to that of the first embodiment. Of course, in this embodiment, FIG.
Any arrangement is possible, as shown in FIG.

32-34 show a fifteenth embodiment. In this embodiment, the arrangement of the cylindrical projections 16 and 17 described in the first embodiment is described in US Pat.
It is used in the flat tube of the condenser disclosed in 1,887. With reference to FIGS. 32-34, a flat tube 301 includes a pair of semi-cylindrical plates 30 containing shallow recesses 320 defined therein.
Have two. The plurality of cylindrical protrusions 16 project from the inner bottom surface of the shallow recess 320 of one of the pair of plates. A plurality of cylindrical protrusions 17 project from the inner bottom surface of the shallow recess 320 of the other plate in the pair. Cylindrical protrusions 16 and 17 are located on the inner bottom surface of corresponding shallow recesses 320, respectively, and engage each other when the pair of plates 302 are joined together.

According to this embodiment, the refrigerant flows through the passage 305 defined in the tube unit 301 while taking a complicated flow passage including a diagonal flow passage and a straight flow passage. The heat exchange effect is enhanced more effectively than that of the condenser of US Pat. No. 5,101,887.

FIG. 35 shows the 16th embodiment. In this embodiment, the pair of plates 302 are the plates 302
A long and narrow flat portion 30 continuously extending from the adjacent side end to
It is made integrally through 6. The surface of the flat portion 06 is flush with the side edge of the plate 302. Since the pair of portions 306a cut out in a triangle are formed at the ends of both shafts of the flat portion 306, the flat portion 306 can be easily bent. The pair of plates 302 is the flat portion 3
They are joined together by folding 06. According to this embodiment, the plates 302 are connected by bending the flat portions 306, so that relative sliding of the plates 302 in the radial direction is effectively prevented after the step of temporarily assembling the tube unit 301.

In the fifteenth and sixteenth embodiments, the cylindrical projections 16 and 17 are shown only at the lower ends of the shallow depressions 320 in FIGS. 33 and 35, but the cylindrical projections 16 and 17 are shallow depressions 320. Extends continuously along the entire length of. Further, as shown in FIGS. 33 and 35, the cylindrical projections 16 and 17 are arranged on the plate 302 in a manner similar to that shown in the first embodiment. However, the arrangement of the cylindrical protrusions 16 and 17 on the plate 302 is not limited thereto, and the plate 3 may be arranged as shown in FIGS.
The cylindrical projections 16 and 17 of 02 can be arranged in any manner. Further, as shown in FIGS. 17-27, the cylindrical protrusions 16 and 17 can be any form of connection.

[0064]

As described above, according to the present invention,
It is possible to provide a heat exchanger that can be easily manufactured without making a flex residue in the heat medium flow path of the heat exchanger.

[Brief description of drawings]

FIG. 1 is a front view of a conventional example of a laminated evaporator.

2 is a partially cutaway perspective view of the laminated evaporator shown in FIG. 1. FIG.

FIG. 3 is an exploded view of the laminated evaporator shown in FIG.

FIG. 4 is a front view of the heat exchanger according to the first embodiment of the present invention.

5 is a cross-sectional view of the tube unit taken along the line VV in FIG.

6 is an elevational view showing a plate of the tube unit of FIG. 5 before assembly.

7 is a sectional view taken along the line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

9 is a cross-sectional view showing a pair of plates shown in FIGS. 6 to 8. FIG.

10 is a cross-sectional view showing a state in which the pair of plates shown in FIG. 9 are joined to each other.

FIG. 11 is a view similar to FIG. 6 showing a heat exchanger according to a second embodiment of the present invention.

FIG. 12 is a view similar to FIG. 6 showing a heat exchanger according to a third embodiment of the present invention.

FIG. 13 is a view similar to FIG. 6, showing a heat exchanger according to a fourth embodiment of the present invention.

FIG. 14 is a view similar to FIG. 6 showing a heat exchanger according to a fifth embodiment of the present invention.

FIG. 15 is a diagram of a heat exchanger according to a sixth embodiment of the present invention.
It is a figure similar to.

16 is a cross-sectional view taken along line XVI-XVI of FIG.

FIG. 17 is a cross-sectional view showing a pair of plates of a tube unit included in the heat exchanger according to the seventh embodiment of the present invention.

FIG. 18 is a cross-sectional view of the pair of plates of FIG. 17 joined to each other.

FIG. 19 is a cross-sectional view of the pair of plates of FIG. 17 joined to each other at different positions.

FIG. 20 is a diagram of a heat exchanger according to an eighth embodiment of the present invention.
It is a figure similar to 0.

FIG. 21 is a diagram of a heat exchanger according to a ninth embodiment of the present invention.
It is a figure similar to 0.

FIG. 22 is a sectional view showing a pair of plates of a tube unit included in a heat exchanger according to a tenth embodiment of the present invention.

23 is a cross-sectional view of the pair of plates of FIG. 22 joined together.

FIG. 24 is a cross-sectional view of the pair of plates of FIG. 22 joined to each other at different positions.

FIG. 25 is a view similar to FIG. 10 of a heat exchanger according to an eleventh embodiment of the present invention.

FIG. 26 is a view similar to FIG. 10 of a heat exchanger according to a twelfth embodiment of the present invention.

FIG. 27 is a view similar to FIG. 10 of the heat exchanger according to the thirteenth embodiment of the present invention.

FIG. 28 is a front view of the heat exchanger according to the fourteenth embodiment of the present invention.

FIG. 29 is a view of the tube unit seen from the end face along the line XXIX-XXIX in FIG. 28.

FIG. 30 is an elevational view showing the plate before assembly of the tube unit of FIG. 29.

31 is a sectional view taken along line XXIX-XXIX in FIG. 30.

FIG. 32 is an elevation view of a flat tube constituting a heat exchanger according to a fifteenth embodiment of the present invention.

33 is an elevational view showing a state before assembling the flat tube shown in FIG. 32. FIG.

34 is a sectional view taken along line XXXIV-XXXV in FIG. 32.

FIG. 35 is a view similar to FIG. 33, showing a heat exchanger according to the sixteenth embodiment of the present invention.

[Explanation of symbols]

 201 Tube unit 202 Tray type plate 120 Shallow depression 13 Flange 14 Partition wall 230,240 Cylindrical pipe 231,241 Slot 16,17 Cylindrical protrusion

Claims (10)

[Claims] 1. A plurality of laminated tube units,
Each of the tube units has a first plate and a second plate connected to each other, a fluid passage is provided between the first plate and the second plate and extends from the first plate and the second plate. At least one fluid communication opening communicating with the passageway is provided, each of the first and second plates having a shallow recess, a flange extending along a periphery of the recess, and an intermediate portion of the recess. A plurality of laminated tube units each having a wall portion that is arranged and extends in the range of each of the first and second plates and that separates the left and right sides of the first and second plates; At least one conduit disposed on the top surface, the at least one conduit comprising a plurality of conduits for receiving the at least one fluid communication opening in the plurality of stacked tube units. And a plurality of engaging means provided on at least one of the first and second plates to secure at least one of the first and second plates; The engagement means has a plurality of first protrusions provided in the shallow recess of the first plate and a plurality of second protrusions provided in the shallow recess of the second plate, and The heat exchanger characterized in that the first and second protrusions engage with each other to prevent movement in a direction in which the first and second plates separate from each other and in a direction in which they slide. 2. The first protrusion has a plurality of cylindrical protrusions having a first diameter, and the second protrusion has a plurality of cylindrical protrusions having a second diameter. At least a part of the protrusions is inserted into the second cylindrical protrusions.
The heat exchanger described. 3. Each of the first and second plates comprises:
The heat exchanger according to claim 2, further comprising a plurality of first cylindrical protrusions on the left side of the wall portion and a plurality of second cylindrical protrusions on the left side of the wall portion. 4. The first and second plates include a plurality of first and a plurality of second cylindrical protrusions on the left side of the wall portion and a plurality of first and plurality of cylindrical protrusions on the right side of the wall portion. The heat exchanger according to claim 2, further comprising a second cylindrical protrusion. 5. The heat exchanger according to claim 4, wherein the plurality of first and second cylindrical protrusions are arranged in a plurality of diagonal rows, and each horizontal row is offset from an adjacent horizontal row. 6. The heat exchanger according to claim 4, wherein the first and second cylindrical protrusions are arranged in a plurality of vertical rows on both left and right sides of the wall portion. 7. The heat exchanger according to claim 4, wherein the first and second cylindrical protrusions are arranged in a plurality of horizontal rows on the left and right sides of the wall portion. 8. The heat exchanger according to claim 1, wherein the first and second plates are mounted along a narrow flat portion provided between adjacent flanges. 9. The heat exchanger according to claim 1, wherein the wall portions of the first and second plates have a plurality of openings formed therethrough. 10. The first protrusion has a plurality of cylindrical protrusions having a first diameter, the second protrusion has a plurality of cylindrical protrusions having a second diameter, and a third protrusion. And a fourth protrusion are provided, the sizes of the third and fourth protrusions are made larger than those of the first and second protrusions, and the third and fourth protrusions are connected to each other before the first and second protrusions are combined. The heat exchanger according to claim 1, wherein said protrusion is inserted into said fourth protrusion.